Process for directly producing sponge iron by catalytic partial oxidation of natural gas

Abstract

The invention provides a process for directly producing sponge iron by catalytic partial oxidation of natural gas. The process comprises the following steps: introducing natural gas into a preheater and preheating; enabling the preheated gas to enter a fine desulfurization reactor, carrying out catalytic hydrogenation, desulfurizing at a high temperature and discharging; in a regenerative tubular heating furnace, converting the finely desulfurized natural gas into CO and H2 under the action of lattice oxygen used as a catalyst; enabling the reduced gas to enter a gas-based shaft furnace to produce sponge iron. The process disclosed by the invention is simple and efficient and low in energy consumption, the risk of explosion is avoided, qualified sponge iron reducing gas can be manufactured at a low cost, the entire process system is simple, the process is easily controlled and the industrialization is easily realized.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to a process for producing direct sponge iron by catalytic partial oxidation of natural gas. Background technique [0002] More than 90% of the world's direct reduced iron is produced by the gas-based method. Representative processes are Midrex shaft furnace method and HYL reaction tank method. The Midrex shaft furnace method uses natural gas as raw material gas and top gas as conversion agent, which is reformed to produce high-quality reducing gas. In the reformer, the CO in the natural gas and a part of the top gas 2 and H 2 O undergoes a reforming reaction under the action of a nickel catalyst, and the resulting reducing gas is sent to the shaft furnace for iron reduction reaction. The top gas of the shaft furnace is partly used as a reforming agent and partly as a fuel for a reformer. However, the cost of the reformer in this method is high, and t...

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Problems solved by technology

The catalysts currently used in the CLR process are mainly supported powdered metal oxide catalysts. During use, the reactor is easily blocked, resulting in a large pressure drop in the bed, a large temperature gradient between the beds, and a large thermal resistance. , poor thermal conductivity, it is easy to cause local overheating of the catalyst bed, so that the catalyst is easy to sinter during the reaction process, and the activity drops rapidly, and the granular catalyst has the disadvantages of difficult recovery and low cycle life, which limits the development of this technology

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